CN111607305A - Polymer modified asphalt waterproof paint - Google Patents
Polymer modified asphalt waterproof paint Download PDFInfo
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- CN111607305A CN111607305A CN202010485385.0A CN202010485385A CN111607305A CN 111607305 A CN111607305 A CN 111607305A CN 202010485385 A CN202010485385 A CN 202010485385A CN 111607305 A CN111607305 A CN 111607305A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
- C09D133/04—Homopolymers or copolymers of esters
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D195/00—Coating compositions based on bituminous materials, e.g. asphalt, tar, pitch
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/14—Paints containing biocides, e.g. fungicides, insecticides or pesticides
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention relates to the technical field of waterproof coatings, and particularly relates to a polymer modified asphalt waterproof coating which comprises the following components in parts by weight: 310 parts of acrylic emulsion 290-containing material, 310 parts of heavy calcium powder 290-containing material, 310 parts of emulsion asphalt 290-containing material, 1.5-2.5 parts of dispersing agent, 2-4 parts of defoaming agent, 80-100 parts of water, 1-2 parts of bactericide, 2-3 parts of thickening agent, 1-2 parts of stabilizing agent and 1.2-2 parts of anti-cracking agent. The polymer modified asphalt waterproof coating provided by the invention has a good anti-cracking effect.
Description
Technical Field
The invention relates to the technical field of waterproof coatings, in particular to a polymer modified asphalt waterproof coating.
Background
Along with the continuous improvement of the living standard of people, the environmental protection consciousness is also continuously enhanced, and the environmental protection is the basic principle that people need to follow together to develop modern industry. In recent years, the development of waterproof coatings in China has made great progress, and the development is continuously carried out from solvent type to emulsion type and from low grade to waterproof coatings with high elasticity, high weather resistance, environmental protection and multiple functions.
The polymer modified emulsified asphalt is an oil-in-water modified asphalt emulsion which is formed by thermally melting and modifying asphalt, dispersing the asphalt in a water solution containing an emulsifier in small particles through the mechanical action, and has low viscosity and can meet different construction requirements; however, the existing polymer modified asphalt waterproof coating is easily subjected to fine cracks due to the influence of external factors such as illumination, temperature, moisture and the like, and the cracks are continuously expanded along with the prolonging of time, so that the waterproof performance is finally influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a polymer modified asphalt waterproof coating which has a good anti-cracking performance.
In order to achieve the purpose, the invention provides the following technical scheme:
a polymer modified asphalt waterproof coating comprises the following components in parts by weight.
310 parts of acrylic emulsion 290-containing material, 310 parts of heavy calcium powder 290-containing material, 310 parts of emulsion asphalt 290-containing material, 1.5-2.5 parts of dispersing agent, 2-4 parts of defoaming agent, 80-100 parts of water, 1-2 parts of bactericide, 2-3 parts of thickening agent, 1-2 parts of stabilizing agent and 1.2-2 parts of anti-cracking agent.
By adopting the technical scheme, the acrylic emulsion is used as the base material, and the emulsified asphalt is mixed with the acrylic emulsion, so that the waterproof effect of the waterproof coating can be improved as the emulsified asphalt has good dispersibility, elasticity and toughness; the heavy calcium powder is a powdery inorganic filler, is easy to disperse in the coating, has good thermal stability, can not be decomposed below 400 ℃, is easy to disperse in the mixture, and has high strength, so that the thermal stability and the strength of the coating are improved; the dispersant can disperse the particles to be dispersed in the waterproof coating on the surface, so that the waterproof coating has better stability and the stability of the waterproof coating is improved; the water is used for replacing the traditional volatile organic solvent, so that the waterproof coating has the characteristics of safety, no toxicity, low pollution and the like; the waterproof coating is easy to generate bubbles during production and use, the coating effect of the waterproof coating can be influenced by the existence of the bubbles, and the defoaming agent is uniformly dispersed in the waterproof coating, so that the generation of the bubbles can be inhibited, the breaking of the generated bubbles can be accelerated, and the coating effect of the waterproof coating is improved; the bactericide can prevent the growth of microorganisms in the waterproof coating, and reduce the problem that the use of the waterproof coating is influenced by the deterioration of the waterproof coating caused by the corrosion of bacteria in the production operation process, the packaging and storage of finished products and the film forming process of the coating; the thickening agent can thicken the coating, prevent the sagging phenomenon caused by over-thin coating and ensure the coating effect of the waterproof coating; the stabilizer can change the bonding strength among molecules of the waterproof coating, reduce the problems of flocculation and sedimentation, improve the stability of the waterproof coating and enhance the bonding capability of the waterproof coating; the crack resistance agent is filled in the gaps of the coating components, so that the compactness of the coating is enhanced, the generation of tiny cracks is reduced, and the crack resistance of the waterproof coating is improved.
The invention is further provided with: the anti-cracking agent comprises one or more of lignocellulose, calcined kaolin and sodium polyacrylate.
By adopting the technical scheme, the lignocellulose is an organic flocculent fiber substance, has good flexibility and dispersion shape, can fill gaps among the components of the coating after being mixed into the coating, enhances the connection strength among the components, inhibits the separation among the components on a microscopic scale, thereby reducing the generation of macroscopic cracks and improving the crack resistance of the waterproof coating; meanwhile, the fiber structure of the lignocellulose can quickly transmit the moisture in the coating to the surface of the coating, so that the moisture in the coating is uniformly distributed, and the problem of cracks caused by stress concentration due to nonuniform moisture distribution is solved; calcined kaolin as a hydrophilic filler can be uniformly dispersed in gaps between lignocellulose and coating molecules, so that the porosity of the waterproof coating is reduced, the waterproof coating is more compact, and the migration among components is more difficult, thereby improving the crack resistance of the waterproof coating; the sodium polyacrylate has good dispersibility, so that the calcined kaolin and the lignocellulose are uniformly dispersed in the waterproof coating, the problem of stress concentration caused by uneven dispersion of the calcined kaolin and the lignocellulose is solved, the stability of the waterproof coating is improved, the sodium polyacrylate can be used as a water-retaining agent, the viscosity of the waterproof coating is ensured, the water is prevented from being sucked out, and the stability of the waterproof coating is improved.
The invention is further provided with: the cracking-resistant agent comprises lignocellulose, calcined kaolin and sodium polyacrylate in a weight part ratio of 2:1: 1.
By adopting the technical scheme, the weight part ratio of the lignocellulose, the calcined kaolin and the sodium polyacrylate is limited, and the lignocellulose accounts for a large proportion, so that the crack resistance of the waterproof coating is favorably improved; the proportion of the sodium polyacrylate and the calcined kaolin is smaller, and the cost of the sodium polyacrylate is higher than that of the lignocellulose and the calcined kaolin, so that the cost of the anti-cracking agent is reduced while the stability of the waterproof coating is improved by the sodium polyacrylate; the addition of the calcined kaolin aids in the dispersion of the calcined kaolin.
The invention is further provided with: the lignocellulose is modified, and the modification treatment comprises the following steps: 1) cleaning, drying and cutting the wood into 1m3-2m3The block of (1); 2) placing the cut wood blocks in a sodium hydroxide solution with the mass fraction of 4%, stirring, and soaking; 3) fishing out the wood blocks in the step 2), cleaning and drying, then crushing and ball-milling the wood blocks until the granularity is less than 120 meshes to obtain the modified lignocellulose.
By adopting the technical scheme, the lignocellulose mainly comprises the cellulose, the hemicellulose and the lignin, the lignin can be dissolved in alkaline solution, and OH in sodium hydroxide solution-Can weaken hydrogen bond between cellulose and hemicellulose and saponify ester bond between hemicellulose and the lignin molecule to arouse the swelling of wood fiber raw materials, result in inside surface area to increase, inside waterproof coating got into lignocellulose more easily, after lignocellulose mixes in waterproof coating, can play the effect of parcel bonding each component, reduce the production of crackle, promoted waterproof coating's anti-cracking property.
The invention is further provided with: the stabilizer is starch-carboxymethyl cellulose copolymer.
By adopting the technical scheme, the starch is a high molecular compound with cohesiveness, so that the adhesive property of the waterproof coating can be enhanced, the cohesive strength of each component is improved, and the stability of the waterproof coating is improved; after the carboxymethyl cellulose is dissolved in water, the aqueous solution of the carboxymethyl cellulose has the effects of adhesion, emulsification, suspension and the like, so that the viscosity of the water phase in the waterproof coating is improved, the carboxymethyl cellulose can be uniformly dispersed on the surfaces of particles, and an interface film is formed on the surfaces of the particles, so that the particles are mutually collided and are not easy to coalesce, the problems of flocculation and sedimentation of the waterproof coating are reduced, and the stability of the waterproof coating is improved; meanwhile, the carboxymethyl cellulose and the starch can form a multidimensional reticular structure, the multidimensional reticular structure is dispersed in the waterproof coating, and all components of the waterproof coating are bonded together through the reticular structure, so that the separation of the components on a microcosmic scale can be reduced, and the crack resistance of the waterproof coating is improved.
The invention is further provided with: the preparation method of the starch-carboxymethyl cellulose copolymer comprises the following steps:
1) heating the starch to a gelatinized state; 2) adding an initiator into the gelatinized starch, and uniformly stirring and mixing; 3) adding carboxymethyl cellulose into water, and stirring and mixing uniformly to form a carboxymethyl cellulose aqueous solution; 4) adding the mixed material obtained in the step 2) into a carboxymethyl cellulose aqueous solution, heating in a water bath at 45 ℃ and stirring; 5) and extruding and molding the mixture obtained in the step 4) to obtain the starch-carboxymethyl cellulose copolymer.
By adopting the technical scheme, the starch is gelatinized firstly, so that hydrogen bonds among starch molecules can be broken, the polymerization degree of the starch is reduced, and the copolymerization of the starch and the carboxymethyl cellulose is facilitated; the addition of the initiator increases the free radicals on the macromolecular chain of the starch, so that the carboxymethyl cellulose is easier to polymerize with the starch; the operation process is simple, and the polymerization degree of the starch and the carboxymethyl cellulose is high.
The invention is further provided with: the initiator is FeSO4-H2O2And (3) an initiator.
By adopting the technical scheme, the water-soluble redox initiator is easily dispersed in a system, the activation energy required by the initiation reaction is low, the requirement on the reaction temperature is not high, the polymerization rate is high, and the preparation material rate of the starch-carboxymethyl cellulose copolymer is improved.
The invention is further provided with: the dispersant comprises any one of polyacrylamide, sodium polyacrylate and polyethylene oxide.
By adopting the technical scheme, the dispersing agent can uniformly disperse all components in the system in water to form stable suspension, and the flocculation and layering phenomena are avoided.
In conclusion, the beneficial technical effects of the invention are as follows:
1. the acrylic emulsion is used as a base material, the emulsified asphalt is mixed with the acrylic emulsion, the emulsified asphalt has good dispersibility, elasticity and toughness, the waterproof effect of the waterproof coating can be improved, the crack resistance agent is filled in gaps of coating components, the compactness of the coating is enhanced, and therefore the generation of micro cracks is reduced, and the crack resistance of the waterproof coating is improved;
2. the lignocellulose is an organic flocculent fibrous substance, has good flexibility and dispersion shape, can fill gaps among the components of the coating after being mixed into the coating, enhances the connection strength among the components, and inhibits the separation among the components on a microscopic level, thereby reducing the generation of macroscopic cracks and improving the crack resistance of the waterproof coating;
3. the carboxymethyl cellulose and the starch can form a multidimensional reticular structure, the multidimensional reticular structure is dispersed in the waterproof coating, and all components of the waterproof coating are bonded together through the reticular structure, so that the separation of the components on a microcosmic scale can be reduced, and the crack resistance of the waterproof coating is improved.
Detailed Description
The present invention will be described in further detail with reference to examples.
The acrylate emulsion was obtained from BA-2100 emulsion produced by North technology of east Union (Beijing) Co., Ltd; the initiator is FeSO4-H2O2And (3) an initiator.
Example 1:
the polymer modified asphalt waterproof coating comprises the following raw materials in parts by weight:
example 1 raw material composition and parts by weight ratio table
Wherein, lignocellulose is modified, and the modification treatment comprises the following steps:
1) cleaning, drying and cutting the wood into 1m3The block of (1);
2) placing the cut wood blocks in a sodium hydroxide solution with the mass fraction of 4%, stirring for 30min, and then soaking for 12 h;
3) fishing out the wood blocks in the step 2), cleaning and drying, then crushing and ball-milling the wood blocks until the granularity is 100 meshes, and obtaining the modified lignocellulose.
The preparation method of the starch-carboxymethyl cellulose copolymer comprises the following steps:
1. heating starch in parts by weight to 70 ℃, and stirring for 3 hours until the starch is gelatinized;
2) adding FeSO into the gelatinized starch4-H2O2Stirring the initiator for 30min to uniformly mix the initiator;
3) adding carboxymethyl cellulose in parts by weight into 1L of water, and stirring and mixing uniformly to form a carboxymethyl cellulose aqueous solution;
4) adding the mixed material obtained in the step 2) into a carboxymethyl cellulose aqueous solution, heating in a water bath at 45 ℃ and stirring for 1 h;
5) and extruding and molding the mixture obtained in the step 4) to obtain the starch-carboxymethyl cellulose copolymer.
Example 2:
the polymer modified asphalt waterproof paint has the same material composition and weight ratio as in example 1.
Wherein the lignocellulose is not modified.
The preparation method of the starch-carboxymethyl cellulose copolymer is the same as that of the first embodiment.
Example 3:
the polymer modified asphalt waterproof coating comprises the following raw materials in parts by weight:
example 3 raw material composition and parts by weight ratio Table
Wherein, the modification treatment step of the lignocellulose is the same as the first embodiment.
Example 4:
the polymer modified asphalt waterproof coating comprises the following raw materials in parts by weight:
example 4 raw material composition and parts by weight ratio Table
Wherein, the modification treatment step of the lignocellulose is the same as the first embodiment.
Example 5:
the polymer modified asphalt waterproof coating comprises the following raw materials in parts by weight:
example 5 raw material composition and parts by weight ratio Table
Wherein, the modification treatment step of the lignocellulose is the same as the first embodiment.
Example 6:
the polymer modified asphalt waterproof paint has the same material composition and weight ratio as in example 1.
Wherein, the modification treatment step of the lignocellulose is the same as the first embodiment.
The preparation method of the starch-carboxymethyl cellulose copolymer comprises the following steps:
1. mixing starch and FeSO in weight portion4-H2O2Stirring the initiator for 30min to uniformly mix the initiator;
2) adding carboxymethyl cellulose in parts by weight into 1L of water, and stirring and mixing uniformly to form a carboxymethyl cellulose aqueous solution;
3) adding the mixed material obtained in the step 1) into a carboxymethyl cellulose aqueous solution, heating in a water bath at 45 ℃ and stirring for 1 h;
4) and extruding and molding the mixture obtained in the step 3) to obtain the starch-carboxymethyl cellulose copolymer.
Example 7:
the polymer modified asphalt waterproof coating comprises the following raw materials in parts by weight:
example 7 raw material composition and parts by weight ratio Table
Wherein, the modification treatment step of the lignocellulose is the same as the first embodiment.
The preparation method of the starch-carboxymethyl cellulose copolymer is the same as that of the first embodiment.
Example 8:
the polymer modified asphalt waterproof coating comprises the following raw materials in parts by weight:
example 8 raw materials composition and parts by weight ratio Table
Wherein, the modification treatment step of the lignocellulose is the same as the first embodiment.
The preparation method of the starch-carboxymethyl cellulose copolymer is the same as that of the first embodiment.
Example 9:
the polymer modified asphalt waterproof coating comprises the following raw materials in parts by weight:
example 9 raw material composition and parts by weight ratio Table
Wherein, the modification treatment step of the lignocellulose is the same as the first embodiment.
The preparation method of the starch-carboxymethyl cellulose copolymer is the same as that of the first embodiment.
Example 10:
the polymer modified asphalt waterproof coating comprises the following raw materials in parts by weight:
example 10 raw materials composition and parts by weight ratio Table
The preparation method of the starch-carboxymethyl cellulose copolymer is the same as that of the first embodiment.
Example 11:
the polymer modified asphalt waterproof coating comprises the following raw materials in parts by weight:
example 11 raw material composition and parts by weight ratio Table
The preparation method of the starch-carboxymethyl cellulose copolymer is the same as that of the first embodiment.
Example 12:
the polymer modified asphalt waterproof coating comprises the following raw materials in parts by weight:
example 12 raw materials composition and parts by weight ratio Table
Wherein, the modification treatment step of the lignocellulose is the same as the first embodiment.
The preparation method of the starch-carboxymethyl cellulose copolymer is the same as that of the first embodiment.
Example 13:
the polymer modified asphalt waterproof coating comprises the following raw materials in parts by weight:
example 13 raw materials composition and parts by weight ratio Table
Wherein, the modification treatment step of the lignocellulose is the same as the first embodiment.
The preparation method of the starch-carboxymethyl cellulose copolymer is the same as that of the first embodiment.
Example 14:
the polymer modified asphalt waterproof coating comprises the following raw materials in parts by weight:
example 14 raw material composition and parts by weight ratio Table
The preparation method of the starch-carboxymethyl cellulose copolymer is the same as that of the first embodiment.
Comparative example 1:
the polymer modified asphalt waterproof coating comprises the following raw materials in parts by weight:
comparative example 1 raw material composition and parts by weight ratio table
The preparation method of the starch-carboxymethyl cellulose copolymer is the same as that of the first embodiment.
Comparative example 2:
the polymer modified asphalt waterproof coating comprises the following raw materials in parts by weight:
comparative example 2 raw material composition and parts by weight ratio table
Wherein, the modification treatment step of the lignocellulose is the same as the first embodiment.
Comparative example 3:
the polymer modified asphalt waterproof coating comprises the following raw materials in parts by weight:
comparative example 3 raw material composition and parts by weight ratio table
And (3) performance detection:
the polymer modified asphalt waterproofing paints prepared in examples 1 to 14 and comparative examples 1 to 3 were sampled, and the samples were subjected to the following performance test tests.
The test is carried out according to the standard of polymer emulsion building waterproof paint (JC/T864-2008), and main instruments of the test comprise a DTS-6 waterproof instrument and a QDK type dynamic crack resistance tester.
Standard test conditions: the temperature is 25 ℃ and the relative humidity is 60%, and the sample and the used apparatus are placed under standard test conditions for at least 24 hours before the test.
Sample preparation: stirring the sample placed under the standard test condition uniformly, pouring the sample into a mold frame for coating under the condition of not mixing air bubbles, coating the sample for at least three times during preparation, and performing subsequent coating after the former coating is formed into a film, wherein the thickness of the coating film reaches 2.0 +/-0.2 mm within 72 hours. And curing the prepared sample for 168 hours under the standard condition, demolding, drying in a drying oven at 50 +/-2 ℃ for 24 hours, taking out, and standing for more than 4 hours under the standard condition to obtain the sample.
And (3) measuring the water impermeability:
cutting the test sample into 150mm × 150mm test pieces, placing the test pieces for lh under standard conditions, injecting clean white incoming water into the water-tight tester under standard conditions until the test pieces are full, opening the water inlet valve, then adding water pressure to fill the water in the water storage tank, and removing air. Placing the coating surface of the test piece on a disc of a water impermeability instrument, adding a piece of copper wire mesh cloth with the same size and the aperture of 0.2mm on the test piece, starting and pressing, opening a water inlet valve, closing a total water valve, applying pressure to a specified value, maintaining the pressure for 30min to release pressure, taking down the test piece, observing and recording whether a water seepage phenomenon exists or not, and recording in a performance detection table as follows:
water impermeability performance detection meter
And (3) testing the crack resistance:
the sample paint was knife coated on a 200X 150(mm) asbestos cement board 2mm thick to ensure a smooth surface without air bubbles. The drawdown coated panels were maintained in a standard environment (temperature: 23. + -. 2 ℃ C.; humidity 50. + -. 5%) for 7 days, and 3 panels were prepared for each sample at the same time. Placing a test board on a dynamic anti-cracking tester), enabling one side with a coating layer to face upwards, rotating a screw rod to enable a top cutter to ascend, reducing the ascending speed of the top cutter after the cutter edge is contacted with the test board, paying attention to observing a blank area of the asbestos cement board, observing and recording the width of cracks at any time by using a reading microscope after the cracks appear, and taking the arithmetic average value of three test results of any group of samples as a final result.
Crack resistance detection meter
The detection results in the water impermeability performance detection table and the crack resistance performance detection table show that:
1. examples 1-14 compare comparative examples 1-3: the samples of examples 1 to 14 were not much different in water impermeability from those of comparative examples 1 to 3 at a detection pressure of 0.1 MPa; at 0.2MPa and 0.3MPa, the water impermeability of examples 1-14 is significantly better than that of comparative examples 1-3, which shows that the addition of the stabilizer and the anti-cracking agent can improve the waterproof performance of the waterproof coating to some extent.
2. Example 1 compared to example 2: the crack resistance of the embodiment 1 is better than that of the embodiment 2, which shows that after the lignocellulose is modified, the internal surface area of the lignocellulose is increased, the waterproof coating can easily enter the inside of the lignocellulose, and after the lignocellulose is doped into the waterproof coating, the effect of wrapping and bonding each component can be achieved, so that the crack resistance of the waterproof coating is better improved.
3. Example 1 compared to examples 3-5: the crack resistance of example 1 is better than that of examples 3-5, which shows that when the starch-carboxymethylcellulose compound is selected for stability, the crack resistance of the waterproof coating is the best, and probably the carboxymethylcellulose can form a multidimensional network structure with the starch, the multidimensional network structure is dispersed in the waterproof coating, and all components of the waterproof coating are bonded together through the network structure, so that the separation of components on a microscopic scale can be reduced, and the crack resistance of the waterproof coating is improved.
4. Example 1 compared to example 6: the crack resistance of the example 1 is better than that of the example 6, which shows that the starch is gelatinized in the preparation process of the starch-carboxymethyl cellulose compound, so that the waterproof performance of the waterproof coating can be improved, and probably the gelatinization breaks hydrogen bonds between starch molecules, the polymerization degree of the starch is reduced, and the copolymerization of the starch and the carboxymethyl cellulose is facilitated.
5. Example 1 compared to examples 7-8: the crack resistance of example 1 is better than that of examples 7-8, indicating that the weight ratio of lignocellulose, calcined kaolin and sodium polyacrylate is 2:1: when 1, the water-proof paint has the best anti-cracking performance.
6. Example 1 compared to examples 9-14: the crack resistance of the waterproof coating material in the embodiment 1 is better than that of the embodiment 9-14, which shows that when the crack resistance agent is a mixture of lignocellulose, calcined kaolin and sodium polyacrylate, the crack resistance of the waterproof coating material is the best, and probably the good dispersibility of sodium polyacrylate, so that the calcined kaolin can be uniformly dispersed in gaps between the lignocellulose and the coating material molecules, the porosity of the waterproof coating material is reduced, the waterproof coating material is more compact, and the migration among components is more difficult, so that the crack resistance of the waterproof coating material is improved.
The present embodiment is only for explaining the present invention, and not for limiting the present invention, and those skilled in the art can make modifications without inventive contribution to the present embodiment as needed after reading the present specification, but all of which are protected by patent law within the scope of the claims of the present invention.
Claims (8)
1. The polymer modified asphalt waterproof coating is characterized by comprising the following components in parts by weight:
310 parts of acrylic emulsion 290-containing material, 310 parts of heavy calcium powder 290-containing material, 310 parts of emulsion asphalt 290-containing material, 1.5-2.5 parts of dispersing agent, 2-4 parts of defoaming agent, 80-100 parts of water, 1-2 parts of bactericide, 2-3 parts of thickening agent, 1-2 parts of stabilizing agent and 1.2-2 parts of anti-cracking agent.
2. The polymer-modified asphalt waterproofing coating according to claim 1, characterized in that: the anti-cracking agent comprises one or more of lignocellulose, calcined kaolin and sodium polyacrylate.
3. The polymer modified asphalt waterproofing coating according to claim 2, characterized in that: the cracking-resistant agent comprises lignocellulose, calcined kaolin and sodium polyacrylate in a weight part ratio of 2:1: 1.
4. The polymer modified asphalt waterproofing coating according to claim 3, wherein: the lignocellulose is modified, and the modification treatment comprises the following steps: 1) cleaning, drying and cutting the wood into 1m3-2m3The block of (1); 2) placing the cut wood blocks in a sodium hydroxide solution with the mass fraction of 4%, stirring, and soaking; 3) fishing out the wood blocks in the step 2), cleaning and drying, then crushing and ball-milling the wood blocks until the granularity is less than 120 meshes to obtain the modified lignocellulose.
5. The polymer-modified asphalt waterproofing coating according to claim 1, characterized in that: the stabilizer is starch-carboxymethyl cellulose copolymer.
6. The polymer modified asphalt waterproofing coating according to claim 5, wherein: the preparation method of the starch-carboxymethyl cellulose copolymer comprises the following steps: 1) heating the starch to a gelatinized state; 2) adding an initiator into the gelatinized starch, and uniformly stirring and mixing; 3) adding carboxymethyl cellulose into water, and stirring and mixing uniformly to form a carboxymethyl cellulose aqueous solution; 4) adding the mixed material obtained in the step 2) into a carboxymethyl cellulose aqueous solution, heating in a water bath at 45 ℃ and stirring; 5) and extruding and molding the mixture obtained in the step 4) to obtain the starch-carboxymethyl cellulose copolymer.
7. The polymer modified asphalt waterproofing coating according to claim 6, wherein: the initiator is FeSO4-H2O2And (3) an initiator.
8. The polymer-modified asphalt waterproofing coating according to claim 1, characterized in that: the dispersant comprises any one of polyacrylamide, sodium polyacrylate and polyethylene oxide.
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